Year	Years
1800	38.65
1801	37.35
1802	38.62
1803	37.32
1804	41.44
1805	42.32
1806	43.22
1807	40.05
1808	40.35
1809	41.74
1810	38.35
1811	39.89
1812	41.83
1813	43.04
1814	40.24
1815	41.13
1816	39.94
1817	41.04
1818	39.85
1819	40.52
1820	41.31
1821	41.78
1822	41.35
1823	40.05
1824	39.19
1825	39.94
1826	39.83
1827	41.14
1828	42.03
1829	41.56
1830	43.02
1831	40.84
1832	40.16
1833	41.35
1834	40.78
1835	41.1
1836	41.43
1837	40.2
1838	40.3
1839	40.88
1840	39.93
1841	41.7
1842	41.35
1843	41.86
1844	41.55
1845	42.56
1846	39.96
1847	38.33
1848	39.5
1849	37.38
1850	42.8
1851	41.42
1852	40.93
1853	40.56
1854	39.34
1855	41.03
1856	43.25
1857	41.88
1858	40.04
1859	40.84
1860	43.01
1861	42.38
1862	42.52
1863	40.4
1864	39.97
1865	40.65
1866	40.41
1867	42.62
1868	42
1869	41.67
1870	40.95
1871	41.31
1872	42.9
1873	43.78
1874	42.13
1875	41.85
1876	43.68
1877	44.69
1878	43
1879	44.26
1880	43.77
1881	46.1
1882	44.86
1883	45.08
1884	44.78
1885	45.75
1886	45.31
1887	45.63
1888	46.79
1889	46.32
1890	44.73
1891	44.27
1892	45.49
1893	44.85
1894	48.31
1895	45.71
1896	47.38
1897	47.2
1898	46.95
1899	46.1
1900	46.29
1901	47.88
1902	49.05
1903	50.39
1904	49.07
1905	50.82
1906	50.54
1907	51.4
1908	51.8
1909	52.48
1910	53.94
1911	51.49
1912	54.5
1913	53.78
1914	51.94
1915	48.15
1916	47.68
1917	45.52
1918	40.39
1919	54.06
1920	56.54
1921	58.29
1922	57.07
1923	59.33
1924	58.1
1925	58.44
1926	59.59
1927	58.97
1928	59.91
1929	57.64
1930	60.81
1931	60.03
1932	60.55
1933	60.59
1934	61.31
1935	61.96
1936	61.76
1937	61.79
1938	63.21
1939	63.59
1940	60.88
1941	61.28
1942	63.89
1943	63.91
1944	64.75
1945	65.74
1946	66.36
1947	66.33
1948	68.38
1949	68.07
1950	68.58
1951	68.18
1952	69.48
1953	69.74
1954	70.11
1955	70.08
1956	70.35
1957	70.47
1958	70.64
1959	70.74
1960	70.96
1961	70.71
1962	70.78
1963	70.69
1964	71.47
1965	71.46
1966	71.38
1967	72.01
1968	71.64
1969	71.6
1970	71.84
1971	71.96
1972	72
1973	72.16
1974	72.31
1975	72.5
1976	72.7
1977	72.97
1978	73.11
1979	73.28
1980	73.54
1981	73.79
1982	73.97
1983	74.21
1984	74.45
1985	74.56
1986	74.75
1987	75
1988	75.19
1989	75.4
1990	75.66
1991	75.88
1992	76.11
1993	76.23
1994	76.48
1995	76.63
1996	76.85
1997	77.08
1998	77.27
1999	77.47
2000	77.78
2001	78.04
2002	78.25
2003	78.39
2004	78.76
2005	79.04
2006	79.33
2007	79.58
2008	79.83
2009	80.12
2010	80.34
2011	80.54
2012	80.65
2013	80.74
2014	80.8
2015	80.84
2016	80.89
2017	81.04
2018	81.19